<template>
  <div id="app">
    <div>
      <div style="display: inline-block" v-for="item in arr" :key="item">
        <input type="checkbox" :value="item" v-model="newArr" />
        <span>{{ item }}</span>
      </div>
      <p>你选中的元素, 累加的值和为: {{ total }}</p>
    </div>
  </div>
</template>

<script>
export default {
  name: 'App',
  data () {
    return {
      arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      newArr: []
      // total:0
    }
  },
  // watch:{
  //   newArr(){
  //     return this.total = this.newArr.reduce((prev,item)=>prev+item,0)
  //   }
  // }
  computed: {
    total () {
      return this.newArr.reduce((prev, item) => prev + item, 0)
    }
  }
}
</script>

<style scoped lang="less"></style>
